Denomination: 'Sunstruck'
Botanical Name: Heliopsis helianthoides
Applicant/Holder: Ball Horticultural Company
622 Town Road
West Chicago, Illinois
United States of America
Breeder: Lynn Knosher, Pan American Seed Co., Elburn, United States of America
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2013-05-23
Application Number: 13-8050
Grant of Rights Date: 2015-12-14
Certificate Number: 5153
Grant of Rights Termination Date: 2035-12-14

Variety Description

Variety used for comparison: 'Loraine Sunshine'

Summary: The plants of 'Sunstruck' are shorter with shorter stem internodes than those of 'Loraine Sunshine'. The peduncle of 'Sunstruck' is shorter than that of 'Loraine Sunshine'. The inflorescence of 'Sunstruck' is larger is diameter than the inflorescence of 'Loraine Sunshine'. The ray floret of 'Sunstruck' is longer than the ray floret of 'Loraine Sunshine'. The inner side of the ray floret of 'Sunstruck' is yellow orange whereas it is yellow orange, but more yellow, for 'Loraine Sunshine'.


PLANT: semi-erect growth habit, many inflorescences

PETIOLE: present
LEAF BLADE: shallow indentation of margin, variegation present, main colour of upper side is light yellow, secondary colour of upper side is dark green along primary and secondary veins

FLOWERING SHOOT: flowering laterals present, few flowers per flowering lateral

RAY FLORET: length to width ratio is 4:1, dentate apex with two to three dentations, inner side is yellow orange (RHS 17A-B), outer side is yellow orange (RHS 15A)
DISC: orange yellow

Origin & Breeding History: 'Sunstruck' originated from a controlled cross pollination conducted in Elburn, Illinois in July 2009. The cross was made using the proprietary Heliopsis helianthoides designated '3652-C5', as the female parent, and the proprietary Heliopsis helianthoides designated '3649-A32', as the male parent. 'Sunstruck' was selected in July 2010 based on its compact growth habit, large inflorescence size and early flowering habit. 'Sunstruck' has since been asexually propagated from vegetative cuttings.

Tests & Trials: The comparative trial for 'Sunstruck' was conducted in a polyhouse during the summer of 2014 at BioFlora Inc. in St. Thomas, Ontario. The trial included 20 plants each of the candidate and reference variety. All plants were grown from rooted cuttings and transplanted into 4.4 liter containers on May 12, 2014. Observations and measurements were taken from 10 plants or parts of plants of each variety on July 7, 2014. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Sunstruck' with reference variety 'Loraine Sunshine'

Plant height (cm)

  'Sunstruck' 'Loraine Sunshine'
mean 35.9 52.9
std. deviation 2.93 6.79

Stem internode length (cm)

  'Sunstruck' 'Loraine Sunshine'
mean 4.8 7.1
std. deviation 0.33 1.36

Peduncle length (cm)

  'Sunstruck' 'Loraine Sunshine'
mean 7.8 12.4
std. deviation 1.19 2.31

Inflorescence diameter (cm)

  'Sunstruck' 'Loraine Sunshine'
mean 7.6 6.9
std. deviation 0.19 0.30

Ray floret length (cm)

  'Sunstruck' 'Loraine Sunshine'
mean 3.6 3.0
std. deviation 0.13 0.18

Colour of ray floret (RHS)

  'Sunstruck' 'Loraine Sunshine'
inner side 17A-B 14A
outer side 15A 13A-B

Click on image for larger view
Heliopsis: 'Sunstruck' (left) with reference variety 'Loraine Sunshine' (right)

Click on image for larger view
Heliopsis: 'Sunstruck' (left) with reference variety 'Loraine Sunshine' (right)

Click on image for larger view
Heliopsis: 'Sunstruck' (left) with reference variety 'Loraine Sunshine' (right)

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